How often
For this equipment family the inspection interval is one year unless the relevant standards set a different period. Where a standard sets a shorter interval, the shorter one applies; where the manufacturer's instruction requires more frequent checks, that is followed. The validity of an inspection depends less on its interval than on what the report contains.
What the measurement says
An earthing measurement shows whether fault current can flow safely to earth. But a single resistance value does not show that the conductor has not broken or loosened somewhere; continuity is tested separately.
The effect of season
Soil moisture changes the measurement. A reading taken in a dry period may not represent the same installation at its worst. That is why the date and the conditions of the measurement stay in the report.
An installation that grows
When a new machine, panel or building is added, the earthing network grows with it. An old report does not cover new equipment; when something is added, the measurement is renewed.
In Optifora
The periodic inspection module records the equipment, sets its interval by family, reminds you as the date approaches, and attaches the report to the equipment's record. Equipment past its date appears separately in the list and counts as high risk in the assessment.